blink PLC in hex

from time import sleep
from MiSmSerial import MiSmSerial
# hex bytes to blink Status LED
ON  = bytes.fromhex("05 46 46 30 57 6D 38 30 31 30 31 33 37 0D")
OFF = bytes.fromhex("05 46 46 30 57 6D 38 30 31 30 30 33 36 0D")
plc = MiSmSerial("COM3", baud=9600, timeout=1.0, bcc_mode="enq")
try:
    while True:
        plc._ser.write(ON)
        sleep(1)
        plc._ser.write(OFF)
        sleep(1)
finally:
    plc._ser.write(OFF)
    plc.close()